Growth of Prunus tree stems under simulated microgravity conditions |
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| Authors: | T Nakamura N Sassa E Kuroiwa Y Negishi A Hashimoto M Yamashita M Yamada |
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| Institution: | a Faculty of Science, Japan Women's University, 2-8-1 Mejiro-dai, Bunkyo-ku, Tokyo 112-8681, Japan;b Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Sagamihara-shi, Kanagawa 229-8510, Japan;c Department of Biology, University of the Air, 2-11 Wakaba, Mihama-ku, Chiba 261-0014, Japan |
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| Abstract: | Stem growth of Prunus trees under simulated microgravity conditions was examined using a three-dimensional clinostat. The stems elongated with bending under such conditions. Stem elongation and leaf expansion were both promoted, whereas the formation of xylem in the secondary thickening growth was inhibited under the simulated microgravity condition. In secondary xylem, sedimentable amyloplasts were observed in the 1g control. The present results suggest that stem elongation and leaf expansion may be inhibited at 1g, while growth direction and secondary xylem formation depend on a gravity stimulus. A space experiment is expected to advance research on thickening growth in trees. |
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